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onsemi LM2576T-005G
- Part No.:
- LM2576T-005G
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2576T-005G.pdf
- Description:
- IC REG BUCK 5V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:294
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Product details
Overview
LM2576T-005G from onsemi is a monolithic 3.0 A, 5.0 V fixed-output step-down (buck) switching regulator in TO-220 package. It operates from 7.0 V to 40 V input, delivers ±4% output voltage accuracy over line/load/temperature, features 52 kHz fixed-frequency internal oscillator, cycle-by-cycle current limiting, thermal shutdown, and TTL-compatible ON/OFF control - used in industrial power supplies and embedded DC-DC conversion.
For engineers reviewing the LM2576T-005G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3.0 A output current, 77% typical efficiency at 12 VIN/3.0 A, 1.5 V typical switch saturation voltage, −40 °C to +125 °C operating junction temperature, and compatibility with standard off-the-shelf 100 µH inductors.
Technical Context
The LM2576T-005G integrates a 3.0 A NPN power switch, 1.235 V bandgap reference, error amplifier, 52 kHz oscillator, and PWM comparator in a single TO-220-5 package. Its fixed 5.0 V output is internally trimmed and does not require external feedback resistors.
It implements cycle-by-cycle current limiting with 4.2–6.9 A peak current threshold, thermal shutdown at ~150 °C, and low-power standby mode drawing only 80 µA when the ON/OFF pin is pulled high. The internal 3.1 V regulator powers bias circuitry and enables stable operation across wide input ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over −40 °C to +125 °C, 0.5–3.0 A load, 8–40 V input - ensures stable logic supply without trimming. |
| Max Output Current | Guaranteed 3.0 A continuous - supports high-current microcontroller or FPGA core rails without external boost. |
| Oscillator Frequency | 52 kHz ±10% (±2% from 0–125 °C) - enables use of low-cost, high-saturation-current inductors with minimal EMI filtering. |
| Input Voltage Range | 7.0 V to 40 V DC - accommodates 12 V/24 V industrial buses and automotive battery transients. |
| Efficiency | 77% typical at 12 VIN, 3.0 A load - reduces thermal load vs. linear regulators; often eliminates heatsink requirement. |
| Switch Saturation Voltage | 1.5 V typical at 3.0 A - directly determines conduction loss and impacts minimum dropout capability. |
| Standby Quiescent Current | 80 µA typical at 25 °C - enables low-power system sleep modes without auxiliary LDOs. |
Pinout & Package
LM2576T-005G uses the TO-220-5 package (Case 314D), with heatsink surface electrically connected to Pin 3 (GND). Pin 1 is Vin, Pin 2 is Output (switch emitter), Pin 3 is GND, Pin 4 is Feedback (internally tied for fixed 5 V version), and Pin 5 is ON/OFF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 7–40 V unregulated DC; requires local 100 µF low-ESR capacitor to suppress switching transients. |
| 2 - Output | Emitter of internal NPN switch | Delivers regulated 5 V; PCB copper area must be minimized to reduce EMI coupling into sensitive analog sections. |
| 3 - GND | Circuit ground reference | Common return for input/output capacitors, catch diode, and inductor; serves as thermal path to heatsink. |
| 4 - Feedback | Regulation sense node | Internally connected to 5.0 V divider - no external components required for fixed-output operation. |
| 5 - ON/OFF | Logic-enable control input | TTL-compatible: <1.4 V = ON, >2.2 V = OFF; draws only 15 µA when high - ideal for microcontroller GPIO control. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0 V output | Eliminates external feedback resistors and layout sensitivity - simplifies BOM and improves long-term stability. |
| 3.0 A guaranteed output | Supports single-chip power delivery for mid-power embedded systems without parallel devices or derating. |
| 52 kHz fixed-frequency operation | Enables predictable EMI spectrum and compatibility with low-cost, high-current pulse inductors (e.g., Pulse PE-92108). |
| Thermal shutdown + current limit | Provides autonomous fault protection during overload, short-circuit, or inadequate heatsinking - prevents catastrophic failure. |
| TTL ON/OFF control | Allows system-level power sequencing and low-power sleep states with minimal external logic or driver circuitry. |
Applications
| Industrial PLC Power Supply | Embedded Microcontroller Core Rail |
|---|---|
Use Scenario: Providing clean 5 V power to programmable logic controllers operating in harsh factory environments with 24 V DC bus inputs. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5 V to CPU, I/O buffers, and communication peripherals. Use Value: High efficiency (77%) minimizes heat buildup inside sealed enclosures; wide 7–40 V input range tolerates brownouts and surges. | Use Scenario: Powering ARM Cortex-M or RISC-V SoCs in edge IoT gateways requiring reliable 5 V at up to 3 A. IC Role / Device Role / Timing Role: Main DC-DC regulator supplying core logic voltage; ON/OFF pin synchronized to MCU sleep/wake cycles. Use Value: 80 µA standby current extends battery-backed operation; integrated protection avoids need for external fuse or current monitor. |
| On-Card Switching Regulator | Pre-Regulator for Linear LDOs |
Use Scenario: Compact 5 V rail generation directly on dense PCBs where space prohibits external modules or large heatsinks. IC Role / Device Role / Timing Role: Integrated buck stage replacing discrete transistor-based designs - reduces component count and layout complexity. Use Value: TO-220-5 package allows direct mounting to chassis; only four external components (inductor, diode, input/output caps) required. | Use Scenario: Reducing 24 V industrial input to ~6–7 V before feeding low-noise linear regulators for analog sensor front-ends. IC Role / Device Role / Timing Role: Efficient pre-regulator lowering input-to-output differential voltage seen by downstream LDOs. Use Value: 1.5 V typical switch Vsat limits minimum dropout; 77% efficiency cuts pre-LDO dissipation by >6× vs. direct 24→5 V linear regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HVT-5.0 | Higher 60 V max input rating; otherwise identical electrical specs and pinout. | Better suited for 48 V telecom or automotive cold-crank scenarios where input may exceed 40 V. | Select when input voltage may transiently exceed 40 V - same PCB layout, no design requalification needed. |
| MP1584EN-LF-Z | 3 A, 5 V fixed, but 1.5 MHz switching frequency; smaller external components; no integrated catch diode. | Enables ultra-compact designs using 2.2 µH inductors, but requires external Schottky diode and tighter layout for EMI control. | Choose for space-constrained applications where board area is critical and higher-frequency EMI can be managed. |
Compared with LM2576HVT-5.0, the LM2576T-005G offers lower cost and sufficient 40 V input headroom for most industrial 24 V systems; versus MP1584EN-LF-Z, it trades higher-frequency compactness for proven 52 kHz robustness, simpler layout, and integrated diode drive - ideal for reliability-first designs.
Availability
LM2576T-005G is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded microcontroller core rails, on-card switching regulators, and pre-regulator stages requiring stable component supply and long-lifecycle support.
Supply support for LM2576T-005G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi (Nasdaq: ON) is a global semiconductor manufacturer delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The LM2576 series was designed specifically for cost-sensitive, high-reliability DC-DC conversion in industrial and embedded systems - prioritizing simplicity, ruggedness, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2576T-005G?
The LM2576T-005G has an absolute maximum input voltage of 45 V, with recommended operating range from 7.0 V to 40 V DC. Exceeding 40 V continuously risks exceeding thermal limits under full load; for 48 V nominal systems, consider the LM2576HVT-5.0 variant instead. The device includes internal protection but sustained overvoltage degrades long-term reliability.
Does LM2576T-005G require external feedback resistors?
No. The LM2576T-005G is the fixed 5.0 V output version - its feedback divider is fully internal. Pin 4 (Feedback) is pre-connected to the internal 5.0 V reference network and must be left unconnected or tied to output per datasheet guidance. External resistors are only required for the adjustable LM2576-ADJ variant.
What is the typical efficiency of LM2576T-005G at full 3.0 A load?
At 12 V input and 3.0 A output, the LM2576T-005G achieves 77% typical efficiency per the official onsemi datasheet. Efficiency rises to ~88% at higher input voltages (e.g., 15 VIN) due to reduced duty cycle and conduction losses - making it especially effective as a pre-regulator ahead of low-dropout linear regulators.
Can LM2576T-005G be used in negative voltage applications?
Yes - the LM2576T-005G can configure as a buck-boost (positive-to-negative) converter per Figure 1 in the datasheet. When wired with inverted inductor/diode topology, it generates regulated −5 V output. However, output current capability drops to ~1.5 A in this mode due to altered switch stress and diode conduction paths.
What thermal management is required for LM2576T-005G at 3.0 A?
At 3.0 A and 12 VIN, the LM2576T-005G dissipates ~3.5 W. With RJC = 5.0 °C/W and RJA = 65 °C/W (TO-220), a modest 15 cm² aluminum heatsink lowers junction temperature to ~85 °C at 25 °C ambient. No heatsink is needed below ~1.5 A in free air - verified by thermal shutdown activation only above 150 °C junction.
LM2576T-005G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2576T-005G FAQ
1.How can I place an order for LM2576T-005G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2576T-005G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2576T-005G reliable?
The price and inventory of LM2576T-005G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2576T-005G is usually 5 days.
3.What payment methods are accepted for LM2576T-005G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2576T-005G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2576T-005G?
LM2576T-005G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2576T-005G order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2576T-005G?
For technical support, including LM2576T-005G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2576T-005G requirements.
6.How does Aetrix verify that LM2576T-005G is sourced from the original manufacturer or authorized distributors?
All LM2576T-005G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2576T-005G meets industry standards.
7.What is the process for return or replacement of LM2576T-005G?
All LM2576T-005G units undergo pre-shipment inspection (PSI). If there is an issue with LM2576T-005G, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2576T-005G part is unused and in its original packaging.
Return procedure for LM2576T-005G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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